Remove UDT.

net/third_party/udt/RELEASE_NOTES.txt

Index: net/third_party/udt/RELEASE_NOTES.txt
===================================================================
--- net/third_party/udt/RELEASE_NOTES.txt	(revision 78992)
+++ net/third_party/udt/RELEASE_NOTES.txt	(working copy)
@@ -1,23 +0,0 @@
-version 4.9
-
-improved cache code
-removed unnecessary NAK (reduced loss retransmission)
-receiver side error can unblock a blocked sender
-
-version 4.8
-
-fix a bug that may cause seg fault on concurrent close on the same socket
-add epoll support
-increase the listener's scalability to 100K concurrent connections
-fix a bug that may cause accept/select to return positively when an accepted socket is closed immediately after accept returns
-fix a bug that may cause connect to fail if the server closes listening socket immediately after accept returns
-fix recvfile fstream write status bug (e.g., when disk is full, recvfile should handle properly now)
-
-version 4.7a
-
-fix timeout bug introduced in 4.7
-initialize CHandShake
-
-version 4.7
-
-Fix several related bugs that can cause hang/memory leak/segmentation fault during cleanup()